Hi there ByTe,
If I remember correctly Spybot Search & Destroy lets you make a registry backup which it has a re-installation function for.
Also, please don't forget my old favourite:
Registryprot is a nice little utility; but there are other nice freebies there..........you see? uncle nihil spares no expense on your Christmas present
I know.............it's an elk, but we don't seem to have reindeer